This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X25FTC, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI63 Standard Cylinder SI63X25FTC
The AirTAC Airtac SI63 Standard Cylinder SI63X25FTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 25mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X25FTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke25 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X25FTC
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI63 Standard Cylinder SI63X25FTC
The AirTAC SI63X25FTC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 25mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63X25FTC, which preserves the exact ISO 15552 mounting interface, bore, stroke, output force, and port size for existing FTC trunnion fixtures.
The SAI upgrade features a revised piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. Because this specific SI SKU lacks the -S magnet suffix, it cannot accept a position sensor. For load-holding, note that standard cushions only decelerate; explore the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63X25FTC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X25FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X25FTC |
| Bore size | Ø63 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI63X25FTC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The SAI63X25FTC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI63 Standard Cylinder SI63X25FTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×25 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI63 Standard Cylinder SI63X25FTC Is Used
Short-Stroke Clamping
Ideal for holding parts during machining, delivering 1559 N of push force in a compact 25mm stroke.
Package Diverting
Provides robust actuation for diverting arms on packaging lines where a 63mm bore ensures reliable movement.
Ejector Mechanisms
Well-suited for ejecting finished goods from presses, utilizing the FTC trunnion mount for pivot alignment.
Replacing the Airtac SI63 Standard Cylinder SI63X25FTC with the SAI63X25FTC
To replace the discontinued SI63X25FTC, order the SAI63X25FTC. Verify your ISO 15552 FTC trunnion mounting interface, 63mm bore, 25mm stroke, and G3/8 port. This non-magnet SKU cannot host CS1-B/DS1-B sensors; order an -S variant if sensing is needed. For sizing, neighbouring bores are 50mm (982 N push @0.5) and 80mm (2513 N push @0.5). The theoretical max is 318 kgf at 1.0 MPa. Remember, air cushions only decelerate; they do not hold loads. For dead-load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X25FTC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI63 Standard Cylinder SI63X25FTC FAQ
Yes, the SI63X25FTC is discontinued. The direct replacement is the SAI63X25FTC. It maintains the same ISO 15552 mounting interface, 63mm bore, 25mm stroke, force, and G3/8 port, fitting directly into existing fixtures.
This 63mm bore double-acting cylinder features a G3/8 port. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X25FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X25FTC replacement — usually within 7-8 hours.